The File system discovery item has an Override to Skip triggers for defined filesystems.  The Operations for this are set to:

   Trigger prototype matches ^F5 BIG-IP: Low free space in file system.

However, it looks like recently the trigger prototype dropped the F5 BIG-IP: portion from the name, hence the override doesn't match any longer (I can see on a 6.4 host the trigger prototype still had this in the name.

The 7.0 template needs to have the override/trigger prototype name match to not produce alarms for the /usr partition warnings.